﻿// Copyright (c) Microsoft Corporation
//
// All rights reserved. 
//
// Licensed under the Apache License, Version 2.0 (the ""License""); you may not use this file 
// except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 
// THIS CODE IS PROVIDED *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING 
// WITHOUT LIMITATION ANY IMPLIED WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABLITY 
// OR NON-INFRINGEMENT. 
//
// See the Apache Version 2.0 License for specific language governing permissions and limitations under the License.

using System;
using System.Threading.Tasks;
using TED.WindowsAzure.Unplugged.Mobile.Sync.Folder;
using Windows.Storage;
using Windows.Storage.Streams;

namespace TED.WindowsAzure.Unplugged.Mobile.Sync.File
{
    /// <summary>
    ///     Represents the locally synced file.
    /// </summary>
    public class SyncFile : ISyncFile
    {
        private readonly ISyncFolder _folder;

        public SyncFile(ISyncFolder folder)
        {
            if (folder == null)
            {
                throw new Exception("no folder");
            }

            _folder = folder;
        }

        public string ETag { get; set; }

        public bool Exists { get; set; }

        public string FileName { get; set; }

        public string FolderName
        {
            get { return _folder.FolderName; }
        }

        public DateTimeOffset? LastModified { get; set; }

        public Uri Uri { get; set; }

        public SyncFileStatus Status { get; set; }

        public async Task<IRandomAccessStream> OpenReadAsync()
        {
            return await _folder.OpenReadAsync(this);
        }

        public async Task<IRandomAccessStream> OpenWriteAsync()
        {
            return await _folder.OpenWriteAsync(this);
        }

        public async Task DeleteAsync()
        {
            await _folder.DeleteAsync(this);
        }

        public async Task<IStorageFile> GetInternalStorageFile()
        {
            return await _folder.GetInternalStorageFile(this);
        }

        /// <summary>
        ///     Update a file and mark it ready to sync
        /// </summary>
        /// <param name="source"></param>
        /// <returns></returns>
        public async Task InsertAndCommitAsync(IRandomAccessStream source)
        {
            await _folder.InsertAndCommitAsync(this, source);
        }

        /// <summary>
        ///     Update a file and mark it ready to sync
        /// </summary>
        /// <param name="source"></param>
        /// <returns></returns>
        public async Task UpdateAndCommitAsync(IRandomAccessStream source)
        {
            await _folder.UpdateAndCommitAsync(this, source);
        }

        /// <summary>
        ///     Marks the file as ready to sync (inserted or updated based on previous state)
        /// </summary>
        /// <returns></returns>
        public async Task CommitAsync()
        {
            await _folder.CommitAsync(this);
        }

        public void ApplyPropertiesFrom(ISyncFileState state)
        {
            Status = SyncFileStatus.Undefined;

            if (state != null)
            {
                ETag = state.ETag;
                FileName = state.FileName;
                LastModified = state.TimeStamp;
                Status = state.Status;
            }
        }
    }
}